It's not about how low it goes. It all about speed and timing. Intgration with the speakers that is were it's all about. Wenn the Rel sub's would be faster, I would have sold those. It it still that simple!! Compare a subwoofer with one bassunit infront ( sealed) with a subwoofer with more bassunits used. The one with one unit will integrate more easy. Wenn you test stereo, even wenn the subwoofer is on the right side, the energy needs to come from were it is recorded. Wenn you use sub's with more units focus of instruments get less precise. Often wenn you swith the subwoofer from off to on you will hear the increase of the proportion of instruments and voices. It depends just how far you can see!! ( hear) Stereo use is far more difficult for subwoofers. Wenn you work at Highend level instruments are never allowed to become bigger in proportion. These days you can create what I call 'stealth'integration. This means that instruments even become more palpable but stay extreme small in proportion just as in real. And second the energy comes from were it is at the recording. You would be a fool if you are interested in sub's which makes instruments and voices bigger. It needs to be fully integrated with the speakers if they were not there!!
